A Filter Factory That Has Been at It for Over a Decade — How Did They End Up Selling to Europe, America, and Africa?

Honestly, the filter industry is not glamorous.

No buzzwords like "deep tech," no celebrity endorsements. But here is one thing that is undeniably true: billions of engines are running around the world every year, and every single one of them needs a filter change on a regular schedule. A piece of construction equipment digs for a day, and the particles that build up in the hydraulic oil are far more than most people would guess. A heavy-duty truck runs a long haul, and the dust pulled into the intake system is enough to score the cylinder walls.

Use the wrong filter, or skip the change, and the machine starts aging faster than it should.

Zhejiang Zhenhang Industrial Group Co., Ltd., sold under the brand GREEN-FILTER, was founded in 2010. They have been doing exactly this one thing ever since.

About the Factory

More than 30,000 square meters of floor space. Thirteen production lines. Annual output exceeds 5 million units. Over 1,200 product models in the catalog. The company holds ISO/TS16949 certification — the quality management standard for the automotive supply chain. It is not easy to get, and it is not easy to keep.

Their customers are mostly B2B: construction equipment dealers, heavy truck distributors, agricultural machinery manufacturers. Products go to Europe, the Americas, Southeast Asia, and Africa.

Main Products

Oil / Lube Filter

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Engine oil circulates constantly, picking up metal shavings, carbon deposits, and other debris along the way. The oil filter's job is to catch all of that before it gets another pass at the engine's precision parts.

GREEN-FILTER uses a pleated filter medium, which gives it a larger surface area and more dirt-holding capacity than a flat-media design. Two internal features worth knowing about: a pressure relief valve that opens a bypass if the element gets clogged — so the engine does not run dry — and an anti-drainback valve that keeps oil from draining out of the filter after shutdown, which means full oil pressure is available almost immediately on the next start and cold-start wear stays low.

Works with: passenger vehicles, commercial trucks, marine engines, generator sets, gas compressors.

Hydraulic Filter Product link: View Products →

Hydraulic systems run on tight tolerances — clearances measured in microns. A particle the size of a grain of fine sand can seize a valve spool. That is why filtration ratings matter so much here: coarse (>100 micron), standard (10-100 micron), fine (5-10 micron), ultra-fine (1-5 micron). Different applications call for different specs.

GREEN-FILTER carries a large inventory of hydraulic filter replacements, compatible with OEM part numbers from over 250 brands. A lot of their customers switched over from factory-branded elements and found the performance equivalent — at a noticeably lower cost per unit.

Used in: construction machinery hydraulics, industrial hydraulic power units, CNC machine tools, injection molding equipment, marine hydraulic systems.

Air Filter

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A lot of operators underestimate intake air quality — air is air, right? Not when you are working on a construction site or in a quarry. Dust concentrations in those environments are serious, and an engine running without a clean filter does not take long to start showing wear on the cylinder walls.

GREEN-FILTER air filters use high-density pleated filter paper with decent flow resistance characteristics and enough surface area to handle demanding duty cycles. The product line covers two segments: engine intake filters and cabin HVAC filters. The cabin side is often overlooked, but a clogged cabin filter cuts airflow, makes the climate control less effective, and is generally unpleasant for anyone spending hours in the cab.

Fuel / Diesel Filter & Water Separator

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The most common contaminants in fuel are water and particulates. Steel tanks rust over time, and rust particles end up in the fuel. Once those particles reach a high-precision injector, the damage adds up quickly.

The water separator uses a bowl design — water sinks to the bottom and can be drained manually on a regular basis. That is the main line of defense for diesel injection systems. Fuel emulsification is a genuine problem in certain climates and seasons, and these separators earn their keep in those conditions.

Applications: heavy trucks, agricultural tractors, marine engines, standby diesel generators.

Coolant Filter

Coolant degrades over time. Corrosion inhibitors get used up, scale builds up, and corrosion byproducts start accumulating. Once those deposits pack into the radiator, heat transfer efficiency drops. Left long enough, the result is overheating — and that is an expensive problem to fix. GREEN-FILTER coolant filters continuously trap those deposits, extend coolant service life, and keep the radiator passages clear.

Who They Mainly Work With

Construction Machinery

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Excavators, wheel loaders, bulldozers, road rollers — these machines burn through filters at a high rate and in significant volume. GREEN-FILTER has been in this segment for years, covers a wide range of models, and can handle custom requirements for less common equipment.

Agricultural Machinery 

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During harvest season, machines run continuously, and a breakdown at the wrong moment is costly. Tractor and combine operators want replacement parts that are reliable, reasonably priced, and consistently in stock. GREEN-FILTER has built a stable customer base in this segment.

Heavy Duty Trucks

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The heavy truck market is competitive. Buyers are price-sensitive, but they cannot afford to cut corners on quality — a breakdown on the road is expensive in ways that go beyond the repair bill. GREEN-FILTER offers filter replacements compatible with major brands including CAT, Cummins, and JCB. That broad compatibility is a significant part of why truck fleet operators come back to them.

Key Numbers

Item	Data
Founded	2010
Factory Area	30,000+ m²
Annual Capacity	5,000,000+ units/sets
Product Models	1,200+ specifications
Brand Compatibility	250+ OEM brands
Quality Cert.	ISO/TS16949
Markets	Europe, Americas, Southeast Asia, Africa

Contact

You can submit an inquiry directly on the website by leaving your email. They commit to responding within 24 hours.

Official Website	www.internationfilter.com
Oil / Lube Filter	View Products →
Hydraulic Filter	View Products →
Air Filter	View Products →
Fuel / Diesel Filter	View Products →
Construction Machinery	Learn More →
Agricultural Machinery	Learn More →
Heavy Duty Trucks	Learn More →

Zhejiang Zhenhang Industrial Group Co., Ltd.  |  GREEN-FILTER  |  Est. 2010  |  ISO/TS16949 Certified